On the old "milestone" chart, lying is said to generally begin in the later part of 3. This is more of a manipulation sort of thing. Not aimed at mom, but rather at the circumstance required to use the screwdriver.

I would be inclined to find some sort of kit that allows for assembly, disassembly and re-assembly.

Shari
Mom to DS 10, DS 11, DS 13
Ability doesn't make us, Choices do!